STM704R STMICROELECTRONICS [STMicroelectronics], STM704R Datasheet

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STM802, STM804, STM805, STM806 FEATURES SUMMARY RST OR RST OUTPUTS NVRAM SUPERVISOR FOR EXTERNAL LPSRAM CHIP-ENABLE GATING (STM795 only) FOR EXTERNAL LPSRAM (7ns max PROP DELAY) MANUAL (PUSH-BUTTON) RESET INPUT 200ms (TYP) t rec WATCHDOG TIMER - 1.6sec (TYP) AUTOMATIC ...

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STM690/704/795/802/804/805/806 TABLE OF CONTENTS FEATURES SUMMARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

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Figure 21.Reset Comparator Propagation Delay vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . 15 Figure 22.Power-up t vs. Temperature . . ...

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STM690/704/795/802/804/805/806 SUMMARY DESCRIPTION The STM690/704/795/802/804/805/806 Supervi- sors are self-contained devices which provide mi- croprocessor supervisory functions with the ability to non-volatize and write-protect LPSRAM. A precision voltage reference and com- parator monitors the V input for an out-of-toler- CC ance ...

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Figure 5. STM690/802/804/805 Connections SO8/TSSOP8 OUT PFI 4 5 Note: 1. For STM804/805, reset output is active-high and open drain. Figure 6. STM704/806 Connections V BAT (1) RST(RST) WDI ...

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STM690/704/795/802/804/805/806 Pin Descriptions MR (Manual Reset). A logic low on /MR asserts the reset output. Reset remains asserted as long low and for t after MR returns high. rec This active-low input has an internal pull-up. It ...

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Figure 8. Block Diagram (STM690/802/804/805 BAT WDI PFI Note: 1. For STM804/805, reset output is active-high and open drain. Figure 9. Block Diagram (STM704/806 BAT MR PFI V COMPARE SO COMPARE V RST WATCHDOG ...

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STM690/704/795/802/804/805/806 Figure 10. Block Diagram (STM795 BAT E PFI Figure 11. Hardware Hookup Regulator Unregulated V Voltage IN From Microprocessor R1 R2 Note: 1. For STM690/802/804/805. 2. For STM795 only. 3. Not available on STM795. 4. For ...

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OPERATION Reset Output The STM690/704/795/802/804/805/806 Supervi- sor asserts a reset signal to the MCU whenever V goes below the reset threshold (V CC watchdog time-out occurs, or when the Push-but- ton Reset Input (MR) is taken low. RST is guaran- ...

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STM690/704/795/802/804/805/806 Chip-Enable Gating (STM795 only) Internal gating of the chip enable (E) signal pre- vents erroneous data from corrupting the external CMOS RAM in the event of an undervoltage con- dition. The STM795 uses a series transmission gate from E ...

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Power-fail Input/Output (NOT available on STM795) The Power-fail Input (PFI) is compared to an inter- nal reference voltage (independent from the V comparator). If PFI is less than the power-fail threshold (V ), the Power-Fail Output (PFO) will PFI go ...

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STM690/704/795/802/804/805/806 Using a SuperCap™ Backup Power Source SuperCaps™ are capacitors with extremely high capacitance values (e.g., order of 0.47F) for their size. Figure 15 shows how to use a SuperCap as a back-up power source. The SuperCap may ...

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TYPICAL OPERATING CHARACTERISTICS Note: Typical values are Figure 16. V -to-V On-Resistance vs. Temperature CC OUT 5.0 4.0 3.0 2.0 1.0 0.0 –40 –20 Figure 17. V -to-V On-Resistance vs. Temperature BAT OUT 160 140 120 100 ...

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STM690/704/795/802/804/805/806 Figure 18. Supply Current vs. Temperature (no load –40 –20 Figure 19. Battery Current vs. Temperature 1000 100 10 1 0.1 –40 –20 14/ Temperature ( C) V BAT ...

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Figure 20. V Threshold vs. Temperature PFI 1.270 1.265 2.5V 1.260 3. 3.3V 1.255 3.6V 1.250 1.245 1.240 1.235 1.230 1.225 –40 –20 Figure 21. Reset Comparator Propagation ...

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STM690/704/795/802/804/805/806 Figure 22. Power-up t vs. Temperature rec 240 235 230 225 220 215 210 –40 –20 0 Figure 23. Normalized Reset Threshold vs. Temperature 1.004 1.002 1.000 0.998 0.996 –40 –20 16/ Temperature ( C) ...

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Figure 24. Watchdog Time-out Period vs. Temperature 1.90 1.85 1.80 1.75 1.70 1.65 1.60 –40 –20 Figure 25 On-Resistance vs. Temperature CON –40 – Temperature ( C) ...

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STM690/704/795/802/804/805/806 Figure 26. PFI to PFO Propagation Delay vs. Temperature 4.0 3.0 2.0 1.0 0.0 –40 –20 Figure 27. Output Voltage vs. Load Current (V 5.00 4.98 4.96 4.94 0 18/ Temperature ( C) = 5V; V ...

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Figure 28. Output Voltage vs. Load Current (V 2.80 2.78 2.76 2.74 2.72 2.70 2.68 2.66 0.0 Figure 29. RST Output Voltage vs. Supply Voltage 0V BAT 0.2 0.4 I OUT ...

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STM690/704/795/802/804/805/806 Figure 30. RST Output Voltage vs. Supply Voltage Figure 31. Power-fail Comparator Response Time (Assertion) 5V PFO 1.3V PFI 20/32 V RST V CC 500ms/div 500ns/div AI09150b ...

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Figure 32. Power-fail Comparator Response Time (De-Assertion) PFO 0V PFI 0V Figure 33. Maximum Transient Duration vs. Reset Threshold Overdrive 6000 5000 4000 3000 2000 1000 0 0.001 500ns/div Reset occurs above the curve. 0.01 0.1 Reset Comparator Overdrive, V ...

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STM690/704/795/802/804/805/806 Figure 34 Propagation Delay vs. Temperature CON 4.0 3.0 2.0 1.0 0.0 –40 –20 MAXIMUM RATING Stressing the device above the rating listed in the Absolute Maximum Ratings” table may cause per- manent damage to the ...

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DC AND AC PARAMETERS This section summarizes the operating measure- ment conditions, and the DC and AC characteris- tics of the device. The parameters in the DC and AC characteristics Tables that follow, are derived from tests performed under the ...

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STM690/704/795/802/804/805/806 Figure 37. MR Timing Waveform MR tMLRL (1) RST Note: 1. RST for STM805. Figure 38. Watchdog Timing V CC trec RST WDI Table 7. DC and AC Characteristics Alter- Sym Description native Operating Voltage (2) ...

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Alter- Sym Description native Input Leakage Current (MR Input Leakage Current (PFI) Input Leakage Current (WDI) I Output Leakage Current LO V Input High Voltage (MR, WDI Input Low Voltage (MR, WDI) IL Output Low Voltage ...

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STM690/704/795/802/804/805/806 Alter- Sym Description native Reset Thresholds (10) Reset Threshold V RST t RST Pulse Width rec Push-button Reset Input (STM704/806 Pulse Width MLMH RST Output Delay MLRL MRD Watchdog Timer (NOT ...

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PACKAGE MECHANICAL Figure 39. SO8 – 8-lead Plastic Small Outline, 150 mils body width, Package Mech. Drawing Note: Drawing is not to scale. Table 8. SO8 – 8-lead Plastic Small Outline, 150 mils body ...

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STM690/704/795/802/804/805/806 Figure 40. TSSOP8 – 8-lead, Thin Shrink Small Outline, 3x3mm body size, Outline Note: Drawing is not to scale. Table 9. TSSOP8 – 8-lead, Thin Shrink Small Outline, 3x3mm body size, Mechanical Data Symb ...

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PART NUMBERING Table 10. Ordering Information Scheme Example: Device Type STM690/704/795/802/804/805/806 Reset Threshold Voltage T = STM690/704/795/805 = V RST STM802/804/806 = V = 3.00V to 3.12V RST S = STM690/704/795/805 = V RST STM802/804/806 = V = 2.88V to ...

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... STM690/704/795/802/804/805/806 Table 11. Marking Description Part Number STM690T STM690S STM690R STM704T STM704S STM704R STM795T STM795S STM795R STM802T STM802S STM802R STM804T STM804S STM804R STM805T STM805S STM805R STM806T STM806S STM806R 30/32 Reset Threshold 3.075 2.925 2.625 3.075 2.925 2.625 3.075 2.925 2.625 3.075 2.925 2.625 3 ...

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REVISION HISTORY Table 12. Document Revision History Date Version October 31, 2003 1.0 22-Dec-03 2.0 16-Jan-04 2.1 07-Apr-04 2.2 25-May-04 3.0 02-Jul-04 4.0 29-Sep-04 5.0 25-Feb-05 6.0 05-Apr-06 7 Revision Details First Issue Reformatted; update characteristics (Figure ...

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STM690/704/795/802/804/805/806 Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its ...